The test suite does not check that the solution is a character string, but the problem definition requires that it should.
Added this check. (I messed it up a bit the first time I tried to do it, so sorry for some interim weirdness.)
str = num2str(A,formatSpec), could replace '
Invalid solution, really
New test suite invalidates this solution.
Implement a ROT13 cipher
Colon operator of two vectors
Equal to their cube
Matlab Basics II - Intervals
Cull vector elements that contain a specified digit
Right and wrong
All your base are belong to us
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